JPS5988817A - Flat aluminum electrolytic condenser and method of producingsame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat aluminum electrolytic capacitor and a method for manufacturing the same.

A conventional aluminum electrolytic capacitor (CI) j02) has an aluminum electrolytic capacitor element (2) built into a cylindrical aluminum case (1) and a cylindrical rubber seal, as shown in Fig. 1 (a), (1)). It has a cylindrical shape sealed with a body (3). Because this type of cylindrical aluminum electrolytic capacitor has a cylindrical shape, when it is mounted on a printed wiring board of electrical equipment, it is sometimes impossible to achieve high-density mounting in relation to other electrical components. .

However, the present invention provides a flat aluminum electrolytic capacitor that can be mounted at high density and a method for manufacturing the same (2). Condensate→)−(0,)
A flat aluminum electrolytic capacitor is obtained by pressing the lead wire opposite direction aluminum electrolytic capacitor (C2) shown in FIG. 1 θ)).

First, high-purity aluminum foil was etched to obtain a high surface magnification, and an aluminum electrolytic capacitor was created by winding an anodized anode foil and a similarly etched cathode foil with a suitable electrolytic paper in between. After impregnating the element with a prescribed electrolytic solution, the capacitor element is assembled into an aluminum case, sealed with a rubber sealing body, and subjected to a first aging treatment by applying an appropriate voltage to form a cylindrical aluminum electrolytic capacitor similar to the conventional one. get. In the embodiment of the present invention, the rated voltage is 1.6CVL, the rated capacity is j7i10 [μF
An aluminum electrolytic capacitor (hereinafter referred to as a trial electrolytic capacitor) having a -1' line in the same direction as shown in FIG. 1(a) was prepared.

Next, the sample electrolytic capacitor is pressed and crushed using a press.

In this suppression process, it is possible to process one sample electrolytic capacitor transferred by a parts feeder (not shown), or it is possible to process a plurality of sample electrolytic capacitors in a series taped with adhesive tape (4) as shown in Fig. 2. It is also possible to process objects of -.degree. A pressed flat sample electrolytic capacitor (011) fe is shown in FIG.

After the pressing process, in order to remove the dirt caused by the pressing process, it was washed in hot water of 50 to 90 [℃] for 1 hour and 2 minutes.
Dry in a drying oven at 90 to 110 [°C] for 30 to 60 minutes.

Subsequently, in order to repair the deteriorated parts of the anodic oxide film caused by mechanical stress during the suppression process, J:70 to 100 was applied.
A second aging treatment is performed for 1 to 2 hours by applying a required voltage in an atmosphere of [° C.]. In addition, in some cases, the first
It is also possible to omit the aging process and use it also as the second aging process. However, in terms of characteristics, it is preferable to perform the first aging and the second aging separately.

Furthermore, if an incomplete airtight state is created due to deformation in the vicinity of the rubber sealing body (3) due to the compression processing, we can repair it or improve the airtightness even if it is not an incomplete state of airtightness. , rubber old body (3) and resin (5)
) and stir to harden. As the II't/1 resin used, purple M fk nJ resin such as modified phenol resin,
Or use thermosetting resin such as epoxy resin.

See Figure 4.

Next, as a first method of packaging and marking, as shown in FIG. 5, individually marked and printed tubes (6) of heat-shrinkable vinyl or other resin are covered. The second method is to repair the airtightness and leave it in a continuous state.
After 60 seconds of resin dipping, it is cured and displayed/printed. See Figure 6. The resin for dipping (for example, an ultraviolet curing resin or a thermosetting resin. The resin for printing is preferably an ultraviolet curing resin.

Finally, an automatic tester performs various tests to determine pass/fail.

Table 1 shows a comparison of the characteristics of the flat aluminum electrolytic capacitor manufactured by the above process and a conventional cylindrical aluminum capacitor (sample electrolytic capacitor) after pressure treatment and before suppression treatment. . Also, the second
The table shows changes in size.

Table 1 Special deviation In Table 1, the tangent of capacitance and loss angle is 120
[+-12], and the leakage current is the measured value 1 minute after the application of the rated voltage.

Table 2 Change in Size As mentioned above, the aluminum electrolytic capacitor according to the present invention has the advantage of being flat in shape, allowing for high-density packaging. In addition, since cylindrical aluminum electrolytic capacitors are manufactured by suppressing processing, parts can be shared with cylindrical aluminum electrolytic capacitors without separately preparing a flat case, capacitor element, and sealing rubber. There is also an advantage.

[Brief explanation of drawings]

Figure 1 (a), 0)) is a partial cross section and side view of a conventional cylindrical aluminum electrolytic capacitor; Figure 2 is a front view and plan view of a series of processed flat aluminum electrolytic capacitors; The figures are a perspective view and a plan view showing a flat aluminum electrolytic capacitor according to the present invention, FIG. 4 is a perspective view and a plan view of a flat aluminum electrolytic capacitor in which the vicinity of the rubber sealing body is covered with resin, and FIG. FIG. 6 is a perspective view and a plan view showing the entire body covered with resin. In the figure, C1102, C! l...Aluminum electrolytic capacitor, (1)...Case, (2)...Capacitor element, (3)...Rubber sealing body, (4)...Adhesive tape, (5), (7) ...Resin, (6)...Tube. Patent applicant: ELNA Co., Ltd. Figure 3 Figure 4 @ Figure 5

Claims (1)

[Claims] (1) An aluminum electrolytic capacitor element in which an anode foil and a cathode foil are wound with electrolytic paper interposed therebetween is assembled into an aluminum case, and a cylindrical aluminum electrolytic capacitor sealed with a rubber sealing body is pressed. A flat aluminum electrolytic capacitor characterized by being flat. (2. In claim (1), the flat aluminum electrolytic capacitor is coated with resin at least near the rubber sealing body. (3) In claim (1) or (2), the tube is coated with resin. (4) An aluminum electrolytic capacitor element with an anode foil and a cathode foil wrapped around electrolytic paper is assembled into an aluminum case and sealed with a rubber sealing body (1) Cylindrical aluminum electrolytic capacitor A method for manufacturing a flat aluminum electrolytic capacitor comprising a step of suppressing the capacitor and a step of aging the capacitor. (5) The flat aluminum electrolytic capacitor according to claim (4), characterized in that the aging treatment is performed after the cleaning step. Method of manufacturing electrolytic capacitors.